Scan Tool Testing and Procedures
On-Board Diagnostic (OBD II) System CheckCircuit Diagram:
Circuit Description
The On-Board Diagnostic (OBD II) System Check is the starting point for any driveability complaint diagnosis. Before using this procedure, perform a careful visual/physical check of the Engine Control Module (ECM) and the engine grounds for cleanliness and tightness. The OBD II system check is an organized approach to identifying a problem created by an electronic engine control system malfunction.
Diagnostic Aids
An intermittent may be caused by a poor connection, rubbed-through wire insulation or a wire broken inside the insulation. Check for poor connections or a damaged harness. Inspect the ECM harness and connections for improper mating, broken locks, improperly formed or damaged terminals, poor terminal-to-wire connections, and damaged harness.
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On-Board Diagnostic (OBD II) System Check